<template>
  <div id="app">
   <div id="root">
  <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader @addTodo='addTodo'/>
       <MyList :todos='todos'/>
      <Myfooter :todos='todos' @checkAllTodo='checkAllTodo' @clearAllTodo='clearAllTodo'/>
    </div>
  </div>
</div>

  </div>
</template>

<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import Myfooter from './components/Myfooter'
export default {
  name: 'App',
  components: {
    // eslint-disable-next-line vue/no-unused-components
    MyHeader,MyList,Myfooter
  },
   data(){
    return {
      // 由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中(状态提升)
     todos:JSON.parse(localStorage.getItem('todos')) || []
    }
  },
  methods:{
    // 添加一个todo
   addTodo(todoObj){
    //  校验数据

      this.todos.unshift(todoObj)
    },
    // 勾选或者取消勾选一个todo
    checkTodo(id){
      this.todos.forEach((todo) => {
        if(todo.id===id) todo.done=!todo.done
      });
    },
    // 更新一个todo
    updateTodo(id,title){
      this.todos.forEach((todo) => {
        if(todo.id===id) todo.title=title
      });
    },
    // 删除
    deleteTodo(_,id){
    this.todos = this.todos.filter(todo=> todo.id !=id)
    },
    // 全选or全不选
    checkAllTodo(done){
      this.todos.forEach((todo)=>{
        todo.done=done
      })
    },
    // 清除所有已完成的todo
    clearAllTodo(){
      this.todos=this.todos.filter((todo)=>{
        return !todo.done
      })
    }
  },
  watch:{
    todos:{
      deep:true,
      handler(value){
        localStorage.setItem('todos',JSON.stringify(value))
      }
    }
  },
  mounted(){
    this.$bus.$on('checkTodo',this.checkTodo)
    this.$bus.$on('updateTodo',this.updateTodo)
    this.pubId= pubsub.subscribe('deleteTodo',this.deleteTodo)

  },
  beforeDestroy(){
    this.$bus.$off('checkTodo')
    this.$bus.$off('updateTodo')
    pubsub.unsubscribe(this.pubId)

  }
}
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}
.btn-edit {
  color: #fff;
  background-color: skyblue;
  border: 1px solid rgb(65, 113, 133);
  margin-right: 5px;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
